Knock-down tricycle



FIG. 1 is a right rear quarter isometric view of a knock-down tricycle showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a knock-down tricycle, as shown. 